| BLP Central Limited | Extraterritorial | 1998 |
| Blue Gold Group Limited | Other services | 2019 |
| Blue Suede Media Limited | Information & communication | 2016 |
| Blue Valley Construction Ltd | Construction | 2017 |
| Bluebell Mews Management Company Limited | Households | 2022 |
| Blueprint Interiors Limited | Administrative & support | 2001 |
| Bluesky International Limited | Professional & scientific | 2003 |
| Bluesky UK Holdings Limited | Financial services | 2023 |
| Bluesky US Holdings Limited | Financial services | 2023 |
| Bluespace Fitness Ltd | Arts & recreation | 2025 |
| Bluestone Fitness Limited | Arts & recreation | 2016 |
| Bluestone Lake Limited | Professional & scientific | 2013 |
| Blupro Holdings Limited | Financial services | 2023 |
| Blupro Ltd | Construction | 2021 |
| BMJ Engineer Ltd | Professional & scientific | 2025 |
| Boag Properties Ltd | Real estate | 2025 |
| Boedika Limited | Administrative & support | 2008 |
| Bold Face Marketing Ltd | Information & communication | 2014 |
| Bond Venue Design Limited | Administrative & support | 2023 |
| Booker Tree Care Limited | Administrative & support | 2024 |
| Boosted Networks Ltd | Information & communication | 2016 |
| Brackenslack Construction Limited | Construction | 2021 |
| Brackenslack Limited | Real estate | 2018 |
| Bradley Bark Ltd | Real estate | 2025 |
| Brander Property Ltd | Construction | 2023 |
| Brides of Ashby Limited | Administrative & support | 2023 |
| Bridge Alert Limited | Extraterritorial | 2005 |
| Bridgegate Property Developments Ltd | Real estate | 2002 |
| Bright Sky Mortgage Services Limited | Financial services | 2008 |
| Bright Sparks Electrical Contractors Ltd | Construction | 2011 |
| Bright Yellow Consultancy Limited | Professional & scientific | 2013 |
| Brightgrey Consulting Limited | Professional & scientific | 2011 |
| Britannia Land Limited | Construction | 1978 |
| Britannia Land Projects Limited | Construction | 2008 |
| Brondesbury Investments Limited | Administrative & support | 2013 |
| Brookash Building Services Ltd | Construction | 2026 |
| Brookland Residential Limited | Real estate | 2019 |
| Brooksby Consulting Limited | Information & communication | 1988 |
| Brookson (5322D) Limited | Administrative & support | 2007 |
| Brown Clark Group Limited | Mining & quarrying | 2004 |
| Brownacre Limited | Agriculture & fishing | 2009 |
| Brush Electrical Machines Limited | Manufacturing | 1910 |
| Brush Holdco 1 Ltd | Financial services | 2021 |
| Brush Scheme Trustees Limited | Financial services | 2013 |
| Brush UK Holdco Ltd | Financial services | 2021 |
| Bryan Properties Ltd | Real estate | 2015 |
| BS ES Holdings Limited | Financial services | 2020 |
| BS Express Couriers Ltd | Transport & logistics | 2026 |
| BS INT Holdings Limited | Financial services | 2020 |
| BS US Holdings Limited | Financial services | 2020 |
| BS WH Holdings Limited | Financial services | 2020 |
| Btlb Limited | Real estate | 2019 |
| Builder Services Royston Ltd | Construction | 2020 |
| Bullseye Automotive Ltd | Wholesale & retail | 2025 |
| Burton Upon Trent Central LLP | | 2022 |
| BUS Bar Services Limited | Hospitality | 2015 |
| Business Development Systems Ltd | Administrative & support | 2019 |
| Butt Miller Consultancy Limited | Professional & scientific | 2020 |
| Butterfly Castle Day Nursery Limited | Extraterritorial | 2025 |
| Button Technologies Ltd | Information & communication | 2023 |
| BW Apparel Limited | Wholesale & retail | 2025 |
| BY Loans Ltd | Financial services | 2018 |
| C & G Auto Electrics Limited | Wholesale & retail | 2010 |
| C&O Autos Ltd | Wholesale & retail | 2026 |
| Cafe Aurora Ltd | Wholesale & retail | 2025 |
| Cake 0 Emission Limited | Manufacturing | 2021 |
| Calypso's Midland Ltd | Hospitality | 2022 |
| CAM Consultancy Limited | Professional & scientific | 2021 |
| Camlen Fabrications Limited | Construction | 2026 |
| Canine Cage Craft Ltd | Other services | 2017 |
| Cannon Health and Safety Limited | Education | 2008 |
| Capion Limited | Administrative & support | 2021 |
| Capital Developments (Nottm) Limited | Construction | 2022 |
| Carbonright Ltd | Professional & scientific | 2007 |
| Cardio Pet Solutions Ltd | Professional & scientific | 2025 |
| Care Home Health Care Management Limited | Professional & scientific | 2022 |
| Carol Thompson Limited | Arts & recreation | 1989 |
| Caroline Holdaway Design Limited | Other services | 2005 |
| Castle Garage (Ashby) Limited | Wholesale & retail | 2004 |
| Castle Surveys Ltd | Construction | 2017 |
| Castri Trustees Limited | Professional & scientific | 2025 |
| Castri WM Limited | Professional & scientific | 2024 |
| Cave Estates Limited | Professional & scientific | 2018 |
| CC Aesthetics Limited | Other services | 2023 |
| Cdarms Ltd | Information & communication | 2020 |
| Cemblend Ltd | Wholesale & retail | 2020 |
| Central Creation Ltd | Construction | 2018 |
| Central Screen & Crushing Services Limited | Mining & quarrying | 2002 |
| Cerres Limited | Information & communication | 1994 |
| Cestradent Limited | Manufacturing | 1966 |
| Chapel Health and Fitness Studio Limited | Arts & recreation | 2002 |
| Chaptek Ltd | Professional & scientific | 2024 |
| Chapter III Ltd | Information & communication | 2012 |
| Charisma Electronics Limited | Manufacturing | 2005 |
| Charisma Properties Limited | Administrative & support | 2017 |
| Charldom Property Ltd | Real estate | 2019 |
| Charles Williams Lettings Ltd | Real estate | 2008 |
| Chattels Holding Ltd | Financial services | 2023 |
| Chaveney Properties Ltd | Real estate | 2002 |
| Chell Aircraft Spares and Equipment Limited | Wholesale & retail | 1996 |